Automatic reversible hoist



March 18 1924.

C, P. ROSS AUTOMATIC REVERSIBLE HoIsT Filed July 22', 1921 4 sheets-sheet 1 C. F. ROSS AUTOMATIC-REVERSIBLE HoIsT Filed July 22, 1921- 4 Sheets-Sheet 2 jig. 6. Bf

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1,486,93 c. P. Ross AUTOMATIC REVERSIBLE HOIST Filed July 22. 1921 4 sheets-,sheet 'March 1s 1924. Y M8699@ C. F', ROSS lmfa 07' avae/sps Helle ifo/59g .l www' ff @mw Patented Mar. 18, 1924.

UNITED. STATES PATEIVTY CLYDE I. ROSS, OF CHICAGO, ILLINOIS, ASSIGNOR T ROBERTS AND SC COM- PANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

AUTOMATIC REVERSIBLE HOIT.

Application led July 22, 1921. Serial No. 486,783. I

To all whom. zt may concern.:

Be it known that I, CLYDE P. Ross, a citizen of the United States, residing at Chicago, in the county of Cook and State e of Illinois, have invented a certain new and useful Improvement in Automatic Reversible Hoists, of which the following is a specification.

My invention relates to improvements 1n x0 reversing mechanisms and more partlcularly to automatic reversible hosts, and has for one purpose the production of a hoist wherein the excursion of the hoist and the period of loading and dumping at each end of the hosts excursion are accurately and automatically timed. A further object is the provision of a hoist as above described, the clutches of which shall be electrically operated, the electrical energy for 2 such operation being provided, if desired, from a generator driven by or in connection with the conveyor mechanism. A further object is the provision of a brake which shall be operative while the clutches are inoperative at the termination of thehoists excursion. Other objects will appear from time to time inthe course of the specification.

I illustrate the invention more or less l diagrammatically in the following drawings, wherein:

Figure 1 is a plan view of the hoist; Fig. 2 is a side elevation; Fig. 3 is a front end elevation of the hoist;

Fig. 4 is a plan view of the lower portion or level of the hoist; the frame being shown in section along the line 4 4 of Fig. 2.

Fig. 5 is a section with parts in elevation, along the staggered line 5-5 of Fig. 1;

Fig. 6 is Fig. 3;

Fig. 7 isa purely diagrammatic showing of timing and control means.

Like parts are indicated by like symbols throughout the specification and drawings. A is a machinery Asupporting framework of any suitable type supported on a base A1 and having an upper portion A2 adapted 5 to support the various shaft bearings. Ro-

tating in the bearings A3 A5 is 4a shaft A4L normally' in constant uniform rotation, driven throughthe pulley A5 and the belt A5 from a power source not herein shown.

a section on the line. 6-6 of- Mounted on the shaft is a driving pulley A7 adapted to drive a belt A8 which actuates a generator A9 through the pulley A1". r

Rotatably mounted on the-'shaft A41 are the sleeves B, B1, to which are keyed the pinions B2, B5. Secured to the same sleeves, as for example by the bolts Bt, are the clutch disks B5, B, to which` are secured the frictional clutch elements B7, B5, of

any suitable material.

Opposed to these. clutch elements are the magnetic clutch rings C, C1, secured by webs C2, C5, to hubs C4, C5, keyed to the shaft A. Mounted on these hubs are collector rings C", C", suitably connected, electrically, to the ma etic coils C5, C, lying within the rings C1.

Suitable brushes, D, D1, contact the collector rings C, CT, and by electric connections, the details of which are not essential to this invention, deliver to the coils of the clutches current from the generator A.

Mounted on the lower portion of the supporting framework on brackets A11, A12, and rotating in bearings A15, A14, is a countershaft E, having mounted on one end thereof the pinion E1 in mesh with the pinion B2 on the shaft A?, and having mounted on the opposite end the pinion E2 in mesh with the gear F mounted on the shaft F1 which is supported in the bearings F2, F5, of the upper frame portion. Keyed -to the Shaft E midway of itslength is the brake drum E, which is adapted to be engaged by the brake shoes E, E5. The brake shoe E* is pivoted to the link E, which is itself pivoted as at E'I to a plate E5 on the base A and supports a substantially circular disk E9 adapted to t within a hollow E10 in the opposed magnetic brake element. E11. The coiled spring E12`tends to separate' the parts E9 and E11 and thus to force the shoe E" into engagement with the brake.

drum E5. The shoe E5 is pivoted tothe link E15, which in turn is pivoted as atA E1* to the plate E5. The upper end of the link v is pivotally andadjusta ly secured to the rod E15, the opposite end of which is pivoted to the brake elemenuEu. v Thus when the spring E12 is not opposed it tends to draw the two brake shoes together against the brake drum, a tendency which isinterrupted by the attraction of the magnetic brake element when the coil E1a 1s electrically as for example by the wires X6X8.

connected to the generator A",

The shaft F1, on which is mounted the A gear F, has at its opposite end the pinion brake X7 and X8 F, which is in mesh with the gear F5 on the drum shaft F e. The drum Flon the shaft F is adapted to receive 'a cable or cables in the usual manner.

Theelectric connections and control means are diagrammatically shown in Fig. 7, which illustrates a timing shaft X having thereon a timing arm X1 adapted during its revolution, during the upward excursionof the hoist, to make the electric connection for one magnet clutch, and during the opposite excursion of the hoist'to make the electric connection for the other clutch. Intermediate these two positive clutch connections are intervals in which both clutches are electrically. disconnected. Segment X2 diagrammatically illustrates the positive connection during the upward excursionand segment X3 the positive connection during the downward excursion. Segments X4 and X5 illustrate the pause at top and bottom respectively of the hoisting excursion. The electric brake connection through X6, `the Y is diagrammatically shown as being made during these periods of pause, the brake being adapted to be electrically disconnected when both clutches are out, to operate the spring actuated shoes to prevent the release of the brake drum. This showing is purely diagrammatic and is intended'merely to illustrate the type of electric connections employed by applicant. In practice, an automatic electric control is used with the usual type of inclosed control panel and with aldash pot, if desired, which permits a delay of several seconds at the top and bottom of the hoisting excursion. This equipment may be started by any suitable connection or switch, for example the usual form of electric push-button. The details of switch and timing control are not shown, since in practice they vary to suit local conditions, and since they are well known to all in the electrical art.

In addition, I provide a machine type, traveling limit switch which may be geared directly to the drum shaft, and which automatically cuts out the current at the limit of the travel of the drum, thus disconnecting the electric clutch by which the driving pinion is secured against rotation on the driving shaft. The details of this limit switch are not illustrated in the drawings, since many such switches are well known in the hoisting art and the details thereof form no part of the present invention.

While I have illustrated an operative structure, itis obvious that many changes might be made in the number, shape, proportion and relation of parts, and that the description and drawings are to be taken as to a large extent merely illustrative and diagrammatic. I do not wish to be in any sense restricted to the specific form or details herein illustrated.

The use and operation of my invention are as follows:

I have developed an automatic reversing hoist which is adapted to be driven from a constantly rotated shaft. 0n this shaft are two pinions adapted alternately to rotate with said shaft and to ridefreely in relation thereto. One of such pinions is adapted directly to drive the gear F and through it rotate the hoisting drum in 011e direction, while the other pinion drives the gear F through the intermediary of a countershaft and thus drives the drum in the opposite direction. These pinions are associated with electrical clutch elements which areopposed to clutch elements fixed to the shaft. These electric clutches are so connected that when one is in operation the other is out of operation.

I provide any suitable timing arrangement, so that an interval is rovided for at the end of each excursion of) the hoist-for example, for loading or unloading, in which neither clutch is in operation. In order that the drum may not be released during such pause, I provide an electric brake on the countershaft which is adapted to hold the countershaft and, through the train'of gears controlled thereby, the drum during the pause in the hoisting operation.

I have illustrated certain types of electrical clutch and electrical brake, but it is obvious that the same result could be obtained by other types of electrical apparatus and even rby non-electrical apparatus. The characteristic of my invention is the provision of the alternately active clutches and the association with them of a brake and the operation of both clutches and brake by electricity.

' I claim:

l. In an automatic reversing hoist, a power source and a drive shaft adapted to be continuously driven therefrom in a constant direction of rotation, a driven shaft adapted to be driven from said drive shaft, a pair of pinions rotatably mounted on said drive shaft and an independent driving connection between each of said pinions and the driven shaft, a clutch element for each of said pinions rotatahle upon the drive shaft but in non-rotatable relation with said pinion, magnetic clutch members, non-rotatable on the drive shaft, opposed to each of said clutch elements, and electric connections therefor, control means whereby the magnetic clutch memb adated intermittently to control said driven sha and automatic control means whereby said magnetic clutch members may be actuated one at a time, and whereby said brake ers may be singly actuated, a brake is actuated in the intervals of the actuation pinions rotatable upon the drive shaft but in non-rotatable relation with said pinion, magnetic clutch members, non-rotatable on the drive shaft, opposed to each of said clutch elements, and electric connections therefor, a brake adapted intermittently to control said driven shaft and automatic control means whereby said magnetic clutch members may be alternately actuated with a predetermined interval therebetween and whereby said brake is automatically' actuated throughout the intervals between actuation of the clutch members.

3. In an automatic reversing hoist, a power source and a drive shaft adapted to be continuously driven therefrom in a constant direction of rotation, a driven shaft adapted to be driven from said drive shaft, a pair of pinions rotatably mounted on said drive shaft and an independent driving connection between each of said pinions and the driven shaft, a clutch element for each of said pinions rotatable upon the drive shaft but in non-rotatable relation with said pinion, magnetic clutch members, non-rotatable on the drive shaft, opposed to each of said clutch elements, and electric connections therefor, a brake adapted intermittently to control said driven shaft and a magnetic actuating means therefor, and a unitary electric control means adapted to` actuate the magnetic clutch members alternately with a pre-determined interval between such actuations and to automatically actuatc the brake throughout the intervals between actuation of the clutch members.

4. In an automatic reversing hoist, a power source and a drive shaft adapted to be continuously driven therefrom in a constant direction of rotation, a driven shaft adapted to be driven from said drive shaft, a pair of pinions rotatably mounted on said drive shaft and' an independent driving connection between each of said pinions and the driven shaft, a clutch element for each of saidpinions rotatable upon the drive shaft but in non-rotatable relation with said pinion, magnetic clutch members, non-rotatable on the drive shaft, opposed to each of said' clutch elements, and electric connections therefor, a brake adapted intermittently to control said driven shaft and a magnetic actuating means therefor, and a unitary electric control means adapted to actuate the magnetic clutch members alternately for a pre-determined period with a pre-determined interval between said periods of actuation and to automatically actuate the brake throughout the intervals between actuation of the clutch members.

Signed at Chicago, county of Cook and State of Illinois, this 18th day of July, 1921.

CLYDE P. ROSS. 

